A typical recommendation is about 3-6 feet high.Regardless of the height, the material is going to settle and compress over time; so plan on turning the pile to "fluff" and aerate it (for best results).

+1, I measured my compost - in 1 week, it shrank 1 foot.Re piled in the next bin, and it fluffed up about the same volume.Watered it afterwards, and and in a couple days it started to get smaller again.

Its All in the plan...... min 3x3x3', better 4x4x4' . I suppose that is a start measurement? so YMMV at any given time.